4118281921 has 8 divisors (see below), whose sum is σ = 4438322280. Its totient is φ = 3798705792.

The previous prime is 4118281919. The next prime is 4118281963. The reversal of 4118281921 is 1291828114.

It can be written as a sum of positive squares in 4 ways, for example, as 788991921 + 3329290000 = 28089^2 + 57700^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4118281921 - 2¹ = 4118281919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4118281991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97516 + ... + 133213.

It is an arithmetic number, because the mean of its divisors is an integer number (554790285).

Almost surely, 2^4118281921 is an apocalyptic number.

It is an amenable number.

4118281921 is a deficient number, since it is larger than the sum of its proper divisors (320040359).

4118281921 is a wasteful number, since it uses less digits than its factorization.

4118281921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232115.

The product of its digits is 9216, while the sum is 37.

The square root of 4118281921 is about 64173.8414075393. The cubic root of 4118281921 is about 1602.8960467051.

The spelling of 4118281921 in words is "four billion, one hundred eighteen million, two hundred eighty-one thousand, nine hundred twenty-one".